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* Closes #1992 A function identifier `fun` can be declared as an iterator with ``` syntax iterator fun; ``` For example: ```haskell syntax iterator for; for : {A B : Type} -> (A -> B -> A) -> A -> List B -> List A; for f acc nil := acc; for f acc (x :: xs) := for (f acc x) xs; ``` Iterator application syntax allows for a finite number of initializers `acc := a` followed by a finite number of ranges `x in xs`. For example: ``` for (acc := 0) (x in lst) acc + x ``` The number of initializers plus the number of ranges must be non-zero. An iterator application ``` fun (acc1 := a1; ..; accn := an) (x1 in b1; ..; xk in bk) body ``` gets desugared to ``` fun \{acc1 .. accn x1 .. xk := body} a1 .. an b1 .. bk ``` The `acc1`, ..., `accn`, `x1`, ..., `xk` can be patterns. The desugaring works on a purely syntactic level. Without further restrictions, it is not checked if the number of initializers/ranges matches the type of the identifier. The restrictions on the number of initializers/ranges can be specified in iterator declaration: ``` syntax iterator fun {init: n, range: k}; syntax iterator for {init: 1, range: 1}; syntax iterator map {init: 0, range: 1}; ``` The attributes (`init`, `range`) in between braces are parsed as YAML to avoid inventing and parsing a new attribute language. Both attributes are optional. |
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| .. | ||
| Arity | ||
| Asm | ||
| BackendGeb | ||
| Compilation | ||
| Core | ||
| Examples | ||
| Formatter | ||
| Internal | ||
| Parsing | ||
| Reachability | ||
| Runtime | ||
| Scope | ||
| Termination | ||
| Typecheck | ||
| VampIR | ||
| Arity.hs | ||
| Asm.hs | ||
| BackendGeb.hs | ||
| Base.hs | ||
| Compilation.hs | ||
| Core.hs | ||
| Examples.hs | ||
| Format.hs | ||
| Formatter.hs | ||
| Internal.hs | ||
| Main.hs | ||
| Parsing.hs | ||
| Reachability.hs | ||
| Runtime.hs | ||
| Scope.hs | ||
| Termination.hs | ||
| Typecheck.hs | ||
| VampIR.hs | ||